现场压电红外反射光谱电化学研究邻联甲苯胺的电化学行为

In Situ Piezoelectric Infrared Spectroelectrochemistry for Study of Electrochemical Oxidation of o-Tolidine

利用现场压电红外发射光谱电化学技术研究邻联甲苯胺(OTD)在金电极上的电化学行为。压电电化学结果表明:电位范围对OTD氧化的影响很大。当电位扫至0.6V时,氧化过程中中间体的生成和溶解的同时,部分未溶中间体在电极表面沉积。当电位大于0.65V时,还有OTD的电化学氧化聚合。压电红外反射光谱电化学结果表明中间体是OTD第一氧化产物之间相互作用形成的。进一步考察了肝素大阴离子对OTD的氧化的影响。

In situ piezoelectric infrared spectroelectrochemistry was used to study the electrochemical behavior of o-tolidine （OTD） on the gold electrode. The piezoelectric and electrochemistry results showed that the oxidation of o-tolidine in BR buffer solution was greatly affected by potential. In the range of 0 -0.4 V, the intermediate compound was formed and dissolved during the potential scanning. While the potential was scanned up to 0.6 V the media compound was found to be formed and dissolved, and some of them deposited on the electrode surface at the same time. When the potential was expanded to 0 -0.75 V, the intermediate com- pound formed, dissolved and deposited and the polymerization of OTD was found. The in situ piezoelectric infra- red spectroelectrochemistry showed that the intermediate compound was formed between the first oxidation prod- ucts of o-tolidine. The effect of the large ion such as heparin on the oxidation of OTD was also investigated.